Chapter 2: Connecting Your Studio
7
1. Power Switch
This switch applies power to the Digidesign
ADAT Bridge I/O. The “I” position is on.
The “O” position is off.
2. Sync Mode LEDs
These LEDs indicate which master sample
clock reference is currently being used by
the ADAT Bridge I/O. The ADAT Bridge
I/O’s 16 inputs and outputs are divided
into 2 discrete groups: Group A (channels
1–8) and Group B (channels 9–16).
Internal
When lit, this LED indicates that the ADAT
Bridge I/O sample clock reference is its own
internal clock. The internal clock fre-
quency is determined by the Sample Rate
setting in the Pro Tools Hardware dialog or
Session Setup window. Internal sync mode
is used whenever the ADAT Bridge I/O’s
sample rate clock is not being determined
by an external source such as an ADAT,
DAT machine, or synchronization periph-
eral.
ADAT
When continuously lit, the ADAT Bridge
I/O sample rate is being slaved to an ADAT
(the ADAT Bridge I/O is using the ADAT as
its master clock reference). This parameter
is set by choosing ADAT Optical in the
Sync Mode pop-up in the Pro Tools Hard-
ware dialog or Session Setup window. If
this LED is flashing, it indicates that the
ADAT Bridge I/O is either not receiving a
signal from the ADAT or that the signal is
invalid for some reason.
Digital
When continuously lit, the ADAT Bridge
I/O is being slaved to an external AES/EBU
or S/PDIF signal (the ADAT Bridge I/O is us-
ing the signal as its master clock reference).
This parameter is set by choosing Digital in
the Sync Mode pop-up in the Pro Tools
Hardware dialog or Session Setup window.
This is the setting typically used for trans-
ferring material from DAT machines or
other digital devices into Pro Tools. If this
LED is flashing, it indicates that the ADAT
Bridge I/O is either not receiving an
AES/EBU or S/PDIF signal or that the signal
is invalid for some reason. This could occur
Figure 1. ADAT Bridge I/O front panel
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ADAT Bridge I/O Front Panel
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